// collectiontopics/Stacks.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Demonstration of Stack Class

import java.util.LinkedList;
import java.util.Stack;

enum Month {
    JANUARY, FEBRUARY, MARCH, APRIL,
    MAY, JUNE, JULY, AUGUST, SEPTEMBER,
    OCTOBER, NOVEMBER
}

public class Stacks {
    public static void main(String[] args) {
        Stack<String> stack = new Stack<>();
        for (Month m : Month.values())
            stack.push(m.toString());
        System.out.println("stack = " + stack);
        // Treating a stack as a Vector:
        stack.addElement("The last line");
        System.out.println(
                "element 5 = " + stack.elementAt(5));
        System.out.println("popping elements:");
        while (!stack.empty())
            System.out.print(stack.pop() + " ");

        // Using a LinkedList as a Stack:
        LinkedList<String> lstack = new LinkedList<>();
        for (Month m : Month.values())
            lstack.addFirst(m.toString());
        System.out.println("lstack = " + lstack);
        while (!lstack.isEmpty())
            System.out.print(lstack.removeFirst() + " ");

        // Using the Stack class from
        // the Collections Chapter:
        onjava.Stack<String> stack2 =
                new onjava.Stack<>();
        for (Month m : Month.values())
            stack2.push(m.toString());
        System.out.println("stack2 = " + stack2);
        while (!stack2.isEmpty())
            System.out.print(stack2.pop() + " ");

    }
}
/* Output:
stack = [JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE,
JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER]
element 5 = JUNE
popping elements:
The last line NOVEMBER OCTOBER SEPTEMBER AUGUST JULY
JUNE MAY APRIL MARCH FEBRUARY JANUARY lstack =
[NOVEMBER, OCTOBER, SEPTEMBER, AUGUST, JULY, JUNE, MAY,
APRIL, MARCH, FEBRUARY, JANUARY]
NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL
MARCH FEBRUARY JANUARY stack2 = [NOVEMBER, OCTOBER,
SEPTEMBER, AUGUST, JULY, JUNE, MAY, APRIL, MARCH,
FEBRUARY, JANUARY]
NOVEMBER OCTOBER SEPTEMBER AUGUST JULY JUNE MAY APRIL
MARCH FEBRUARY JANUARY
*/
